Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-04-30
1993-12-07
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
3581931, 358198, 4551613, 4551542, 4551913, H04N 560, H04N 550
Patent
active
052687120
ABSTRACT:
Apparatus and method for frequency-tuning the frequency-modulated sound carriers of multichannel sound transmission signals in a satellite television receiver. By utilizing digital signal processing, the audio range of the television satellite channel is searched for the desired sound carrier in steps. Then the FM center frequency is determined by calculating the average amplitude density in each measurement interval.
REFERENCES:
patent: 4698670 (1987-10-01), Matty
patent: 5103313 (1992-04-01), Chan et al.
Patent Abstract of Japan; vol. 12, No. 256 (E-635); Jul. 19, 1988.
Elektronik; Bk. 6; Mar. 16, 1990; pp. 50-56; T. Hilpert U. A.: "Digitaler Multistandard-Audio-Chipsatz, AMU 2481 vs Audio Processor for Video Recorders and Satellite Receivers"; Feb. 18, 1991, ITT Semiconductors, Freiburg, Germany.
Hilpert Thomas
Mueller Stefan
Deutsche ITT Industries GmbH
Groody James J.
Lee Michael H.
Peterson Thomas L.
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